PragmaDev Studio is a modeling and testing software tool introduced by PragmaDev in 2002 dedicated to the specification of communicating systems. It was initially called Real Time Developer Studio or RTDS. Its primary objective was to support SDL-RT modeling technology. Since V5.0 launched on October 7, 2015 RTDS is called PragmaDev Studio, and it is organized in four independent modules: Specifier, Developer, Tester and Tracer. V5.1 launched on November 29, 2016 introduces a freemium licensing model.